The real question is why is the senate conservative fund and some tea party groups wasting their limited resources on dividing conservatives with the support of a guy whose record is worse than McConnell's (Bevin supported the bailout, McConnell voted against it).
There are no "moral victories" in politics, just wins and losses. In a year where the GOP has a chance of taking the senate and controlling the agenda, why are these groups spending money to go after an incumbent Republican with more of the same, rather than helping a conservative win one of the empty seats or win a seat from a vulnerable Democrat.
"Rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law' because law is often but the tyrant's will, and always so when it violates the rights of the individual." Thomas Jefferson
"If people can’t trust not only the executive branch but also don’t trust Congress, and don’t trust federal judges, to make sure that we’re abiding by the Constitution with due process and rule of law, then we’re going to have some problems here." - Barack Obama, June 7, 2013